make sure the symlink with the old name "ispconfig.vhost" is removed before the new one with the name 000-ispconfig.vhost is created.

Author: tbrehm

install/lib/installer_base.lib.php

@@ -837,6 +837,7 @@ public function install_ispconfig()
 		//copy('tpl/apache_ispconfig.vhost.master', "$vhost_conf_dir/ispconfig.vhost");
 		//* and create the symlink
 		if($this->install_ispconfig_interface == true) {
+			if(!@is_link("$vhost_conf_enabled_dir/ispconfig.vhost")) unlink("$vhost_conf_enabled_dir/ispconfig.vhost");
 			if(!@is_link("$vhost_conf_enabled_dir/000-ispconfig.vhost")) {
 				exec("ln -s $vhost_conf_dir/ispconfig.vhost $vhost_conf_enabled_dir/000-ispconfig.vhost");
 			}